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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0e634cc1ce4c4c846398d55813ea5a8a4645501f7bbab2564bb0982a00413e' 
  AND token = 'QHkEAQP+yoarrp7du9Im+Q5OX6HI5KvF0UXUOM9500M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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