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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb1e7cfbbc35feeda139c3cb90d5d57f5609c17a473cd0d7514247e3e182363' 
  AND token = '40Hjr4jvzugTYR8GRq0KKURTuI4XllbY0XDUZZ84bog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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