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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6493e0992bf493287d6b5aea8c7ca5031c15b6bb97dd5a62b2a0f850be6e5c21' 
  AND token = 'GN3uwpibAj/lN1BxWK3rz5P1JSuVRT0epHabnsqeaXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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