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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9b87a518927e06c2e49005d60b9ac0507e693c420c8100253f7455dcd5f4aa' 
  AND token = 'caSBkPR4kO64hunYVEbl/bL1x0HqzxMuPnExSPNsRXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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