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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32bdacab311e061969a8588245e895785f6b4b774f48c5892449f674a33ce0aa' 
  AND token = '8ko/R5uFxF87EHyUwkFkfTnmCurpppRHF2CivM1niME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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