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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0bc34e81075c1392fb12afa6290e8a636a1261c2794404ba136d786492ebee' 
  AND token = 'SxIvPgOXFnCZRirS6bBbGyixojJ2B9znKhUx1mFbod4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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