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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f694651326524686207fe09905dcb4cfc71a1a5a25fd8898dd6f528f6525ed' 
  AND token = 'AlLaEe9ehMFClF0G+c0a8fb4Y6q4wBW38FYrVooFBl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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