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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbcce8ff9043f49322231078965bce5eb5883b625f0c2ff0d8d3f464391ecfe' 
  AND token = 'f8U+jhxi5jnHZ/DTNmY42cGyAJbq0sxWTxTDgUOp7R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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