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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29408051a39aa6097cdf9c76eb5c5cd55fa659d8f722916b2c53d51afaaac89' 
  AND token = 'jxK1hsn8AkzSP6w6Hz3J+a1EIWj0wos02/xQ8oik60M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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