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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7701c95e21dbde1377c6e2ff78e692cdc2cc45a3bdec2879a1f151f26b56f4f0' 
  AND token = 'DONlXaitiIQCy56bXoNUim/oKnumHBHeqjTkDiZ4z2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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