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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dafef225df616bc999eb93c281d98c204844a399bd32df8bab2031da6773e03' 
  AND token = 'zEJIBWUCjQeH0HgCPETsA8kZRWGB52Sy2gZ8SIk35TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}