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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bedf6fa2f7257d2ec7a86dab43ecb428f472ba6ee8ae7dab55e17934341df2' 
  AND token = '72pVeWtPi3fJBI3NtFkQq94ng8CHoraKvqGMQftTSoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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