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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cb482021e654620f6ba9c08ca5d7ab0a8307b23e04b01dabf237cfc62b0a70' 
  AND token = 'Fvz10v12x04hjM4GL2ETddKK8cNOWQuLkhliuVSjm5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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