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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031672990cae29c7d253ec43368c71f243b5bd867ab5aa5d821acf02e9d3a55b' 
  AND token = '0ZF3oc4onq8aUHrDWsWjy2iby37lkRtZJIEqyEnBBD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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