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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d15cf6b2af6ca01d91e909b9d838a71a9ad414fe3ca0570e201b5da724255b' 
  AND token = 'Nr7CN14SJCXTYUqbgJ7OpvYkJkrkVBknxjmFVdHB4OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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