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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3dfa9bc5fa489d60dd08402c21964e3d300fc275bd96af5134dbcb208a506d0' 
  AND token = 'SNn/iMkH1joxA573Nb7tvjY3IrqZIiOT9XWcnyiTZUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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