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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12c0d02b5742220ac7bde549024d13fcac1919766ef494e87217de09999ef8e' 
  AND token = 'QLLDti2gQ1N3iBf6kiD65igEW8ARxmf0+oujCz5wgsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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