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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef57fbfee18f8ed124a82ecab43a133dfcdb106d4a16325777343a548bd7352' 
  AND token = '1EWcfmKmAgXldKRPK0+Sdj9f6KytpvBTtEMnPLcE1A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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