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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901dfe6f1db52eaac7b66c1262bf07f897feff56c1f77a28bdfc83c9ca6074b7' 
  AND token = '1Nds6xEV/vAykSDYEjD6nyS4LSObLTOjwQPj/jVvS3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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