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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb086714d3e84ee1f939324efa403a87d2a3e4dd21a996f52ddf9c870483d1c' 
  AND token = 'SbdQYqOeuKpU6j9Tb4KiMBIX4aqYa11iDWMR96Iyp0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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