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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f02f6255ff84da1a0e4401f684f5f65f9ad24335eedcb252081efda31fd68ce' 
  AND token = 'vUmj0WHg3xwe5GabY76753tHWBLPhdLkhS7XgTmjNZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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