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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c11bf17ca80b8099e5c987a7e12f76fffd5ac5f812a7505929c9e971d87f0c7' 
  AND token = 'Z6pJNstFqWglwM82zjVGd4coJfYNfVIZaLRz4WYXhF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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