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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c0b96a365012ad22e4e0ab824181ac28190d05a227928fc1c3a9f9c4a1f3d9' 
  AND token = 'l+HG/J/FpcCid9bvAYfIgZ4i+JhdeGFkjjxHhO1Fc0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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