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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18c30912bf3a3d5797412e6d510d5025bfc1065c9dab648248eb4340c18f17e' 
  AND token = 'a3vCVU6gr0dpgLQlin/l63scXLHg7gzG81eSjC3Fd0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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