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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19327cc4ea8e802be64e9d9f9ea8c5d62d2883ed16e39c8a4d5cfce6a71d2ba3' 
  AND token = 'eNPQ9/apie5VYXj4wI3teUpOnyhy+Qaxj9aPFW1mdIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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