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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cb4a7e4f62b372c23f4bfc6a9077bbda2a8d9ddd805d6772f09ae36ac21df1' 
  AND token = 'zV4SVAEpg9inPFd8469eVydK7czlcdiPAikndvPpzg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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