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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681f38ead91175762d1a9b43845090684d69bf0086317bc4d702c2dcb1bda798' 
  AND token = 'Ufkukfr4vDuhe1EhyIu4vqnZx3c8wCmxBkknk4HCpVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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