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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0a7d0108ce1023ad9f7795dd5f0849825db8fc38f110c9382334f0eee129e4' 
  AND token = 'xYy96U78QUnG6tIaHYdUJ2j2LdjrNH5Gkif0zShVYvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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