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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c7191820cde2313c0ac9216be70d32db1e6394b0513461dea7c0737a6b82b9' 
  AND token = 'UwT3QKbL2HSr10kn8dq3C7JxzPeqmNwW/apHsPDqB2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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