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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b502852f45d4009a0a84ae17657fbbe4f8f64aa536665772e4dbc193639de09' 
  AND token = 'gozWKiaQ9+MHAhORwPy28b1wXpgRf73ll/I/Iy5KTcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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