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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f01a470fae27c2cdfd410e3b4eedabd0b7c6e038b56305f60144d177945640' 
  AND token = '418P+leyQ51V8YDLA9PmTI2mjnJvPVOLo5oN42bKPfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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