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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b1e7fef6304acd70287ed961002fa80cdd85e4eef997294b1a4f65c9ee66da' 
  AND token = 'K7+ulj7OYq0Dm31dM++e29OPGzzy4SYQsbSSCKbA6CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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