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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c9896c86eb5945662a3efa96cb072521261e20c890e93161d3ccce39e09fcc' 
  AND token = 'eKNdCzNlcKGqnJjZtu31GUYdkeR7FMCp5UQg0OTg0/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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