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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee1a484c87517e3afd1f667d040972759e21a8cae76d38741313495e0b61292' 
  AND token = '5hnM4cSLleyUfzhhAsLELzgFf8yxU5VCQQ0I7jNSjxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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