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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9aed9e0ef9d5e91bdaaad91850def4f3801168fe2601703774db6ad211b2cac' 
  AND token = 'WwGxiaWbRGkHFfpiHvqYqZ+rEJrQgkw1GRAxHNK5jSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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