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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e561ec0976f918fc70d96c06546e048e42b1c9171e0012837e4edac8593ed5' 
  AND token = 'HV1eG6sKE+O6tNW035tn0n+NKu8sowNUf3Gryuuc7u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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