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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7620e3f39bb5b9939816cc45ada49d7b262b34dd92f6c1fc0e2d7c93c385e614' 
  AND token = 'mtoL1kzLfhypLwSyg0tq8gUT3C/+ryuCasqOs0xZFzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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