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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1804486c5c71aa4cfaa92d0917a5b54636d3107725f5ad83b53a022d1b1603cf' 
  AND token = 'Zg4g4xlH8lG8LCJ+2sjbcet0R+kWa/+2TQuFJT4242Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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