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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870c91db72c3d4193862126ba37f38e632e3283b4403b44abf33deff28b5fbbb' 
  AND token = 'oclB8hPEs/EUsfZ7hoELtZny/0aRayP80mI97Tuv89A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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