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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb82b356f18a48b3689cdb474cf53245e521e60a529cd80589da9a1f00862c5' 
  AND token = 'DFMpEsn7pgxPksB4ajVZqp4i8dH82Kpyu+vcrFpypsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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