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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48e0d88e90c8794d2dc1d870e32fb4ca2a2bc9a7e8df18277f8d0fb27886f23' 
  AND token = 'jWf2g2uDyN/ANh02q/krk4qQiNsOZTqPzTqUVvaSuh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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