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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26028aa6e4bd9d57ee355b2d3c2ff86edeb690fc11f5c5624243ffef762b7f77' 
  AND token = '8AB5X39r1EldIK/FzSCNUMvgN+tsSQCf71l5TCGarok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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