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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ecb33b0b6c7799b75f5df9ec008941fa793ef9beb26e67dea7eece0e72fb92' 
  AND token = 'iw+ef9meT9O+Lt52YN7NrDYQGq+x4vDa/AlRrytD5xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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