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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dba79dc7fc2633eff1750be5ccb23a003ef3f3c8fd234613ee7ae062ae76903' 
  AND token = 'Kfhpod/9FLvNaZ3I54lDMkriEQmvG02WOwv1MZohuNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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