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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5dace821e2cef299b86c617fb3352264cec118a00d1ce7e9fdbb34239fb3123' 
  AND token = 'g4TpdVERX6X+vDIbNV3MZv49qccoDfur9shJ42avvp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00123

JSON explain

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