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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5ed81768ae0994ec425b2e7883e58e484e32ef25d0f7fbce455d3eeeba9ac0' 
  AND token = 'uS98/jFHdQBrEjFnagIq55dwp6qUR5bNbz/XhDpzD/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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