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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e7de31448ac6a66a1ddfe67dcf1759a3c1e3cf22bb0265f769ac3fc976fbf2' 
  AND token = '/jhR1I54w0gDN6g/+d3nb1MciRHrHgfLV9Xa+zGVkPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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