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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0157fbb9e32206c73c65caa644b1bc75711426e77d1fe515d0b02f81b21499' 
  AND token = 'cU9gpk9GLR3yzd1nRs49Ka7oBrqcCQYDUXDTS/bBd8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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