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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96adeb5a9d53065506c6b3385d14f8c4273b794c3d0597d20fd668e82dd539b' 
  AND token = 'VB7RfJBy10uAVoXpEEvLQ/fFX/TisR+E3EwivMAph/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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