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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86de0fa173d4d41d7bb886c3fb9522a7a077ae5d86d21b4615c8da1b94f1a2f8' 
  AND token = 'eUg05bQRKufpHENaEIxza6eazbNUhOoQ5Zpa0tBqiz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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