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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0365609da53a0076d617ac46c75d034c8f75a12f55be32bce3cb7146ccc8ac78' 
  AND token = 'r+4OtgcI5P+CS8lnrIx004CU1Tls9lP9qtvCmQN8pQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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