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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9457359d25758ea0655774b81d4742467e9321b6afea31a211f1bd2319552aa' 
  AND token = '2wKCU3usEowPRYsSE/0JBXMP6e4SyO90E2NNyMtY7VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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