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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b712b19f5c17f23cd09c03e2e2d704f246c8f9596fc61bf7c7b6ee988c91ede2' 
  AND token = 'dI4ohFcDbl8+hp2gezO0R6vGbv/IlJC3wbhYsKfmL/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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