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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a700220a91ea459b8dcb41a9eb798fe857dd6cb896abdb1e738b5ebd9717d63' 
  AND token = 'nUre94DylHR414Z1X3NGjkPaQUjyGyfPPMAwkrxn7aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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