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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11a05a461cd07132e620436beb4d4b531268d3e9c2722b34776b5def7202ef6' 
  AND token = '0dEBrgWkGfaBxChDvy9WALqYZxynshhbjVaTWXKNdQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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