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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993b02d85a4d47e89d3e91ed6f1318b54008e3287356c0a78f356777ed5495e4' 
  AND token = '1Te0qenHkC42k6hyPeVV0z4mJSUt6ct9GTvrMc0HPf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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