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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adddc1316049dc30d5e14a327b7a43af06bfc5a57a24c7ccfa421c01cd7e0355' 
  AND token = 'uOnNyphm6FP2+tal2GLhJGLDabVOBzpCa0Qkiw6i66E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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