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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7762f098c82a0b4458527710f349152d0572c8393fe1f7e3c3eab2203e2371f9' 
  AND token = 'R+6AVLOpIht/Zm3NbIfZXw2JCXc4OWUnN8h+KUR1KVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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