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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726ba61bb88d97944c444956932c4dc4491596a5b62490355323c637291896ff' 
  AND token = 'hOYoeVyS0ftyZeFPhdYXy1omQn0xq0YMKHFH0cH2XrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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