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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3eca1e956f77e85d736f3512a19dc9a010c206aa558267a5b094365a32d047' 
  AND token = 'nrUiZ0VE5RHKKrtEJnLwuDYtvs1RAUqA9aaLyiJNvIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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